The battery builders club

How-Tos & Esk8 mechanics
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1429

I like to dremel my nickel strip a little before I solder, really helps with the solder sticking

1 Like
1430

Add 2 more on each side? For redundancy? :ok_hand:

1431

I make score marks with a exacto knife.

@Flasher mabye

But hell thats a little over kill for a 12s3p

1 Like
1432

Also, that copper braid looks pretty soldered… looks like it would be pretty much stiff… kinda defeats the purpose of using it

3 Likes
1433

Its tinned so thats how it looks, its semi flexible in its current states.

The middle does look a little rough but still flexes so :man_shrugging:

1 Like
1434

Th danger of soldering too much is it makes the fine threads of the braid brittle and prone to breaking with repeated flex

7 Likes
1435

If this is to a somewhat flexible battery you will have problems as time goes on, the braid is soaked in solder, so it can break after a while

3 Likes
1436

Its not a flexible pack so there shouldnt be any problems, its going into a tayto.

3 Likes
1437

Anyone here built a segmented ‘flight’ battery? I got a good idea on how i wanna do it, but would love to see others ideas

1 Like
1438

yes. I recall someone at our old forum. Can’t provide the link now.

1 Like
1439

Can someone explain to me what “overcharge protection” and overcharge release" are in bms settings?

1440

Overcharge protection means your bms switch off the charger as soon as one cell, or p group in our case hit the cut off voltage. That’s usually 4.25v depending on the bms for sure.

1 Like
1441

@Andy87 Okay I have a configurable bms. Do you know what the release function is for?
Screenshot_20191009-125908_Chrome
Image pulled from someone else’s settings

1442

I‘m not entirely sure. Might be like a hysteresis like the min voltage when the bms could start to cut off but latest when the max limit is reached.

If somebody know better I would be interested too.

1 Like
1443

Potato packs, rejoice! Also have a pack underway. Used flat braid in the past but trying my hand with silicone now. For science

image
D89A1F0E-7F74-4239-9DA6-3D2514BC5D30.jpeg3024×4032 4.77 MB

@Kellag’s pack

3 Likes
1444

I think the release it is were it is set up, maybe smart bms?, by the owner; in other worth bms start to work from that setting. Over charge protection it is probably set up to the maximum V the bms will allow to handle before it will shut off for protection or burn a fuse (lets says you went downhill fully charged, this will give just s sec to full break until its shut off)

1445

i want to purchase a battery while i wait on repairs so i can keep riding. How would a 10s8p fair with 6374 motors v.s 12s4p? 75 dollar difference between the two.

1446

Same cells?
80cells vs 48cells so longer range
8p vs 4p so more discharge
10s vs 12s so less top speed

2 Likes
1447

ok got it…thx

1 Like
1448

I think release is the voltage at which the bms starts letting current through once it’s tripped protection.

So following the specs above, bms will cut off charge when any cell hits 4.2. It’ll stay locked out until that cell goes below 4.05.

1 Like